chmhelp: added components and example to load chm files in LCL applications

git-svn-id: trunk@37982 -

.gitattributes

@@ -383,6 +383,10 @@ components/anchordocking/minide/simplefrm.pas svneol=native#text/plain
 components/anchordocking/minide/unit1.lfm svneol=native#text/plain
 components/anchordocking/minide/unit1.pas svneol=native#text/plain
 components/chmhelp/README.txt svneol=native#text/plain
+components/chmhelp/democontrol/ContextHelpDemo.lpi svneol=native#text/plain
+components/chmhelp/democontrol/ContextHelpDemo.lpr svneol=native#text/plain
+components/chmhelp/democontrol/ctxchmhelpunit1.lfm svneol=native#text/plain
+components/chmhelp/democontrol/ctxchmhelpunit1.pas svneol=native#text/plain
 components/chmhelp/democontrol/helpconnectionunit1.lfm svneol=native#text/plain
 components/chmhelp/democontrol/helpconnectionunit1.pas svneol=native#text/plain
 components/chmhelp/democontrol/lhelpconnectiondemo1.lpi svneol=native#text/plain
@@ -413,6 +417,7 @@ components/chmhelp/lhelp/lnethttpdataprovider.pas svneol=native#text/plain
 components/chmhelp/packages/help/Makefile svneol=native#text/plain
 components/chmhelp/packages/help/Makefile.compiled svneol=native#text/plain
 components/chmhelp/packages/help/Makefile.fpc svneol=native#text/plain
+components/chmhelp/packages/help/lazhelpchm.pas svneol=native#text/plain
 components/chmhelp/packages/help/lhelpcontrol.pas svneol=native#text/plain
 components/chmhelp/packages/help/lhelpcontrolpkg.lpk svneol=native#text/plain
 components/chmhelp/packages/help/lhelpcontrolpkg.pas svneol=native#text/plain

components/chmhelp/democontrol/ContextHelpDemo.lpi

@@ -0,0 +1,92 @@
+<?xml version="1.0"?>
+<CONFIG>
+  <ProjectOptions>
+    <Version Value="9"/>
+    <General>
+      <SessionStorage Value="InIDEConfig"/>
+      <MainUnit Value="0"/>
+      <Title Value="ContextHelpDemo"/>
+      <ResourceType Value="res"/>
+      <UseXPManifest Value="True"/>
+      <Icon Value="0"/>
+    </General>
+    <i18n>
+      <EnableI18N LFM="False"/>
+    </i18n>
+    <VersionInfo>
+      <StringTable ProductVersion=""/>
+    </VersionInfo>
+    <BuildModes Count="1">
+      <Item1 Name="Default" Default="True"/>
+    </BuildModes>
+    <PublishOptions>
+      <Version Value="2"/>
+      <IncludeFileFilter Value="*.(pas|pp|inc|lfm|lpr|lrs|lpi|lpk|sh|xml)"/>
+      <ExcludeFileFilter Value="*.(bak|ppu|o|so);*~;backup"/>
+    </PublishOptions>
+    <RunParams>
+      <local>
+        <FormatVersion Value="1"/>
+      </local>
+    </RunParams>
+    <RequiredPackages Count="2">
+      <Item1>
+        <PackageName Value="lhelpcontrolpkg"/>
+      </Item1>
+      <Item2>
+        <PackageName Value="LCL"/>
+      </Item2>
+    </RequiredPackages>
+    <Units Count="2">
+      <Unit0>
+        <Filename Value="ContextHelpDemo.lpr"/>
+        <IsPartOfProject Value="True"/>
+        <UnitName Value="ContextHelpDemo"/>
+      </Unit0>
+      <Unit1>
+        <Filename Value="ctxchmhelpunit1.pas"/>
+        <IsPartOfProject Value="True"/>
+        <ComponentName Value="Form1"/>
+        <HasResources Value="True"/>
+        <ResourceBaseClass Value="Form"/>
+        <UnitName Value="CtxCHMHelpUnit1"/>
+      </Unit1>
+    </Units>
+  </ProjectOptions>
+  <CompilerOptions>
+    <Version Value="11"/>
+    <Target>
+      <Filename Value="ContextHelpDemo"/>
+    </Target>
+    <SearchPaths>
+      <IncludeFiles Value="$(ProjOutDir)"/>
+      <UnitOutputDirectory Value="lib/$(TargetCPU)-$(TargetOS)"/>
+    </SearchPaths>
+    <Linking>
+      <Options>
+        <Win32>
+          <GraphicApplication Value="True"/>
+        </Win32>
+      </Options>
+    </Linking>
+    <Other>
+      <CompilerMessages>
+        <MsgFileName Value=""/>
+      </CompilerMessages>
+      <CompilerPath Value="$(CompPath)"/>
+    </Other>
+  </CompilerOptions>
+  <Debugging>
+    <Exceptions Count="3">
+      <Item1>
+        <Name Value="EAbort"/>
+      </Item1>
+      <Item2>
+        <Name Value="ECodetoolError"/>
+      </Item2>
+      <Item3>
+        <Name Value="EFOpenError"/>
+      </Item3>
+    </Exceptions>
+  </Debugging>
+</CONFIG>

components/chmhelp/democontrol/ContextHelpDemo.lpr

@@ -0,0 +1,20 @@
+program ContextHelpDemo;
+
+{$mode objfpc}{$H+}
+
+uses
+  {$IFDEF UNIX}{$IFDEF UseCThreads}
+  cthreads,
+  {$ENDIF}{$ENDIF}
+  Interfaces, // this includes the LCL widgetset
+  Forms, ctxchmhelpunit1, lhelpcontrolpkg;
+
+{$R *.res}
+
+begin
+  RequireDerivedFormResource := True;
+  Application.Initialize;
+  Application.CreateForm(TForm1, Form1);
+  Application.Run;
+end.
+

components/chmhelp/democontrol/ctxchmhelpunit1.lfm

@@ -0,0 +1,54 @@
+object Form1: TForm1
+  Left = 545
+  Height = 239
+  Top = 193
+  Width = 359
+  Caption = 'Form1'
+  ClientHeight = 239
+  ClientWidth = 359
+  OnCreate = FormCreate
+  LCLVersion = '1.1'
+  object Edit1: TEdit
+    Left = 71
+    Height = 22
+    Top = 72
+    Width = 225
+    HelpType = htKeyword
+    HelpKeyword = 'example/MainPage.html'
+    TabOrder = 0
+    Text = 'Edit1'
+  end
+  object Edit2: TEdit
+    Left = 71
+    Height = 22
+    Top = 128
+    Width = 224
+    HelpType = htKeyword
+    HelpKeyword = 'example/SecondPage.html'
+    TabOrder = 1
+    Text = 'Edit2'
+  end
+  object ShowHelpButton: TButton
+    Left = 70
+    Height = 20
+    Top = 20
+    Width = 128
+    AutoSize = True
+    Caption = 'ShowHelpButton'
+    OnClick = ShowHelpButtonClick
+    TabOrder = 2
+  end
+  object CHMHelpDatabase1: TCHMHelpDatabase
+    AutoRegister = True
+    Filename = '../../../tools/chmmaker/example.chm'
+    KeywordPrefix = 'example/'
+    left = 80
+    top = 168
+  end
+  object LHelpConnector1: TLHelpConnector
+    LHelpPath = '../lhelp/lhelp'
+    AutoRegister = True
+    left = 256
+    top = 168
+  end
+end

components/chmhelp/democontrol/ctxchmhelpunit1.pas

@@ -0,0 +1,87 @@
+{
+Abstract:
+  This example demonstrates the chm help components.
+
+  TCHMLHelpDatabase handles help for a single chm file - it contains the
+  mapping from Keyword to page.
+
+  TLHelpConnector starts "lhelp" a chm viewer written in pure pascal.
+
+How was the example created:
+    Put a TCHMHelpDatabase on a form.
+    Set AutoRegister to true.
+    Set KeywordPrefix to 'example/'
+    Set Filename to the path of the chm file '../../../tools/chmaker/example.chm'
+    You can create the example.chm with chmmaker (see the REDAME.txt
+    in the chmmaker directory).
+
+    Put a TLHelpConnector on the form.
+    Set AutoRegister to true.
+    Set LHelpPath to '../lhelp/lhelp'.
+
+    Put a TEdit on a form.
+    Set HelpType to htKeyword
+    Set HelpKeyword to 'example/MainPage.html'
+
+    Run the program.
+    Focus the edit field and press F1. lhelp will be started. lhelp will load
+    example.chm and show the page MainPage.html.
+}
+unit CtxCHMHelpUnit1;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, FileUtil, Forms, Controls, Graphics, Dialogs, StdCtrls,
+  HelpIntfs, LazHelpIntf, LazHelpCHM;
+
+const
+  {$IFDEF Darwin}
+  HelpShortcut = #$e2#$8c#$98'?';
+  {$ELSE}
+  HelpShortcut = 'F1'';
+  {$ENDIF}
+
+type
+
+  { TForm1 }
+
+  TForm1 = class(TForm)
+    CHMHelpDatabase1: TCHMHelpDatabase;
+    Edit1: TEdit;
+    Edit2: TEdit;
+    LHelpConnector1: TLHelpConnector;
+    ShowHelpButton: TButton;
+    procedure FormCreate(Sender: TObject);
+    procedure ShowHelpButtonClick(Sender: TObject);
+  private
+  public
+  end;
+
+var
+  Form1: TForm1;
+
+implementation
+
+{ TForm1 }
+
+procedure TForm1.FormCreate(Sender: TObject);
+begin
+  CreateLCLHelpSystem;
+
+  Edit1.Text:='Edit1 - Press '+HelpShortcut+' for help';
+  Edit2.Text:='Edit2 - Press '+HelpShortcut+' for help';
+end;
+
+procedure TForm1.ShowHelpButtonClick(Sender: TObject);
+begin
+  // This demonstrates how to show a help item manually:
+  ShowHelpOrErrorForKeyword('','example/AboutLazarus.html');
+end;
+
+{$R *.lfm}
+
+end.
+

components/chmhelp/packages/help/lazhelpchm.pas

@@ -0,0 +1,355 @@
+{
+ *****************************************************************************
+ *                                                                           *
+ *  See the file COPYING.modifiedLGPL.txt, included in this distribution,    *
+ *  for details about the copyright.                                         *
+ *                                                                           *
+ *  This program is distributed in the hope that it will be useful,          *
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of           *
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.                     *
+ *                                                                           *
+ *****************************************************************************
+
+  Author: Mattias Gaertner
+
+  Abstract:
+    Methods and types for simple CHM help using chm viewer "lhelp".
+}
+unit LazHelpCHM;
+
+{$mode objfpc}{$H+}
+
+interface
+
+uses
+  Classes, SysUtils, LazHelpIntf, LazConfigStorage, HelpIntfs,
+  Dialogs, Forms, LazLogger, FileUtil, LHelpControl;
+
+const
+  CHMMimeType = 'application/chm';
+  CHMPathParam = 'path';
+type
+  { TCHMHelpDatabase
+
+    KeywordPrefix: if set, then the database will handle all Keywords
+      beginning with this value. And when the path is created by replacing
+      the prefix with the BaseURL.
+      For example:
+        Create a chm. For example build and run chmmaker in lazarus/tools/chmmaker
+        to create the example.chm (lazarus/tools/chmmaker/example.chm).
+
+        Put a TCHMHelpDatabase on a form.
+        Set AutoRegister to true.
+        Set KeywordPrefix to 'example/'
+        Set CHM file to '../../../tools/chmmaker/example.chm'
+
+        Put a TLHelpRemoteViewer on the form.
+        Set AutoRegister to true.
+        Set LHelpPath to the path of lhelp. E.g. '../../lhelp/lhelp'
+
+        Put a TEdit on a form.
+        Set HelpType to htKeyword
+        Set HelpKeyword to 'example/MainPage.html'
+
+        Run the program.
+        Focus the edit field and press F1. The page 'MainPage.html' will be shown.
+        }
+  TCHMHelpDatabase = class(THelpDatabase)
+  private
+    FFilename: string;
+    FHelpNode: THelpNode;
+    FKeywordPrefix: string;
+    procedure SetFilename(AValue: string);
+    procedure SetKeywordPrefix(AValue: string);
+  public
+    constructor Create(TheOwner: TComponent); override;
+    destructor Destroy; override;
+    function ShowHelp({%H-}Query: THelpQuery; {%H-}BaseNode, NewNode: THelpNode;
+                      {%H-}QueryItem: THelpQueryItem;
+                      var ErrMsg: string): TShowHelpResult; override;
+    function ShowURL(const URL, Title: string;
+                     var ErrMsg: string): TShowHelpResult; virtual;
+    function GetNodesForKeyword(const HelpKeyword: string;
+                                var ListOfNodes: THelpNodeQueryList;
+                                var ErrMsg: string): TShowHelpResult; override;
+    procedure Load(Storage: TConfigStorage); override;
+    procedure Save(Storage: TConfigStorage); override;
+  published
+    property AutoRegister;
+    property Filename: string read FFilename write SetFilename;
+    property KeywordPrefix: string read FKeywordPrefix write SetKeywordPrefix;
+  end;
+
+type
+  TOnFindLHelp = procedure(var Path: string) of object;
+
+  { TLHelpConnector }
+
+  TLHelpConnector = class(THelpViewer)
+  private
+    FConnection: TLHelpConnection;
+    FLHelpPath: string;
+    FOnFindLHelp: TOnFindLHelp;
+    procedure SetLHelpPath(AValue: string);
+  public
+    constructor Create(TheOwner: TComponent); override;
+    function ShowNode(Node: THelpNode; var ErrMsg: string): TShowHelpResult; override;
+    procedure Assign(Source: TPersistent); override;
+    procedure Load(Storage: TConfigStorage); override;
+    procedure Save(Storage: TConfigStorage); override;
+    function GetLocalizedName: string; override;
+    property OnFindLHelp: TOnFindLHelp read FOnFindLHelp write FOnFindLHelp;
+    property Connection: TLHelpConnection read FConnection;
+  published
+    property LHelpPath: string read FLHelpPath write SetLHelpPath;
+    property AutoRegister;
+  end;
+
+procedure Register;
+
+implementation
+
+procedure Register;
+begin
+  RegisterComponents('System',[TCHMHelpDatabase,TLHelpConnector]);
+end;
+
+{ TLHelpConnector }
+
+procedure TLHelpConnector.SetLHelpPath(AValue: string);
+begin
+  if FLHelpPath=AValue then Exit;
+  FLHelpPath:=AValue;
+end;
+
+constructor TLHelpConnector.Create(TheOwner: TComponent);
+begin
+  inherited Create(TheOwner);
+  AddSupportedMimeType(CHMMimeType);
+end;
+
+function TLHelpConnector.ShowNode(Node: THelpNode; var ErrMsg: string
+  ): TShowHelpResult;
+var
+  Path: String;
+  IPCFile: String;
+  URLScheme: string;
+  URLPath: string;
+  URLParams: string;
+  CHMFilename: String;
+  SubPath: String;
+  Response: TLHelpResponse;
+  s: String;
+begin
+  debugln(['TLHelpConnector.ShowNode START URL="',Node.URL,'"']);
+
+  Result:=shrViewerError;
+  ErrMsg:='';
+  if (not Node.URLValid) then begin
+    ErrMsg:='TLHelpConnector.ShowNode Node.URLValid=false';
+    exit;
+  end;
+  if (Node.URL='') then begin
+    ErrMsg:='TLHelpConnector.ShowNode Node.URL empty';
+    exit;
+  end;
+
+  SplitURL(Node.URL,URLScheme,URLPath,URLParams);
+  CHMFilename:=SetDirSeparators(URLPath);
+  if not FileExistsUTF8(CHMFilename) then begin
+    ErrMsg:='chm file "'+CHMFilename+'" not found';
+    exit;
+  end;
+
+  SubPath:='';
+  if LeftStr(URLParams,length(CHMPathParam)+1)=CHMPathParam+'=' then begin
+    SubPath:=URLParams;
+    Delete(SubPath,1,length(CHMPathParam)+1);
+  end;
+
+  if Connection=nil then begin
+    // create a connection to lhelp:
+    FConnection := TLHelpConnection.Create;
+    Connection.ProcessWhileWaiting := @Application.ProcessMessages;
+  end;
+
+  if Connection.ServerRunning = false then begin
+    IPCFile:=ExtractFileName(Application.ExeName);
+    IPCFile+='lhelpconnector';
+    {$IFDEF Unix}
+    if FileExistsUTF8('/tmp/'+IPCFile) then
+      DeleteFileUTF8('/tmp/'+IPCFile);
+    {$ENDIF}
+
+    // get lhelp path
+    Path:=LHelpPath;
+    if Assigned(OnFindLHelp) then
+      OnFindLHelp(Path);
+
+    // append exe extension
+    if (ExtractFileExt(Path)='') and (GetExeExt<>'') then
+      Path:=Path+GetExeExt;
+
+    // search in Path
+    if (Path<>'') and (ExtractFilePath(Path)='') then begin
+      s:=FindDefaultExecutablePath(Path);
+      if s<>'' then Path:=s;
+    end;
+
+    {$IFDEF darwin}
+    // search exe in application bundle
+    if DirectoryExistsUTF8(Path+'.app') then
+      Path:=Path+'.app/Contents/MacOS/'+ExtractFileName(Path);
+    {$ENDIF}
+
+    if not FileExistsUTF8(Path) then begin
+      ErrMsg:='The chm viewer program lhelp was not found at "'+Path+'"';
+      exit;
+    end;
+
+    Connection.StartHelpServer(IPCFile,Path);
+  end;
+
+  Response:=Connection.OpenURL(CHMFilename,SubPath);
+  case Response of
+  srSuccess: exit(shrSuccess);
+  srNoAnswer: ErrMsg:='lhelp does not respond';
+  srInvalidFile: ErrMsg:='lhelp can not open the file "'+CHMFilename+'"';
+  srInvalidURL,srInvalidContext: ErrMsg:='lhelp can not find the help entry "'+SubPath+'"';
+  else
+    ErrMsg:='Something is wrong with lhelp';
+  end;
+end;
+
+procedure TLHelpConnector.Assign(Source: TPersistent);
+var
+  Src: TLHelpConnector;
+begin
+  if Source is TLHelpConnector then begin
+    Src:=TLHelpConnector(Source);
+    LHelpPath:=Src.LHelpPath;
+  end;
+  inherited Assign(Source);
+end;
+
+procedure TLHelpConnector.Load(Storage: TConfigStorage);
+begin
+  inherited Load(Storage);
+  LHelpPath:=Storage.GetValue('LHelp/Path','');
+end;
+
+procedure TLHelpConnector.Save(Storage: TConfigStorage);
+begin
+  inherited Save(Storage);
+  Storage.SetDeleteValue('LHelp/Path',LHelpPath,'');
+end;
+
+function TLHelpConnector.GetLocalizedName: string;
+begin
+  Result:='LHelp Connector';
+end;
+
+{ TCHMHelpDatabase }
+
+procedure TCHMHelpDatabase.SetFilename(AValue: string);
+begin
+  if FFilename=AValue then Exit;
+  FFilename:=AValue;
+end;
+
+procedure TCHMHelpDatabase.SetKeywordPrefix(AValue: string);
+begin
+  if FKeywordPrefix=AValue then Exit;
+  FKeywordPrefix:=AValue;
+end;
+
+constructor TCHMHelpDatabase.Create(TheOwner: TComponent);
+begin
+  inherited Create(TheOwner);
+  AddSupportedMimeType(CHMMimeType);
+end;
+
+destructor TCHMHelpDatabase.Destroy;
+begin
+  FreeAndNil(FHelpNode);
+  inherited Destroy;
+end;
+
+function TCHMHelpDatabase.ShowHelp(Query: THelpQuery; BaseNode,
+  NewNode: THelpNode; QueryItem: THelpQueryItem; var ErrMsg: string
+  ): TShowHelpResult;
+begin
+  ErrMsg:='';
+  Result:=shrContextNotFound;
+  if NewNode.URLValid then begin
+    Result:=ShowURL(NewNode.URL,NewNode.Title,ErrMsg);
+  end else begin
+    Result:=shrContextNotFound;
+    ErrMsg:='TCHMHelpDatabase.ShowHelp Node.URLValid=false Node.URL="'+NewNode.URL+'"';
+  end;
+end;
+
+function TCHMHelpDatabase.ShowURL(const URL, Title: string; var ErrMsg: string
+  ): TShowHelpResult;
+var
+  Viewer: THelpViewer;
+  Node: THelpNode;
+begin
+  //DebugLn('TCHMHelpDatabase.ShowURL A URL="',URL,'" Title="',Title,'"');
+
+  if not FileExistsUTF8(Filename) then begin
+    ErrMsg:='chm help file "'+Filename+'" not found';
+    exit(shrDatabaseNotFound);
+  end;
+
+  // find HTML viewer
+  Result:=FindViewer(CHMMimeType,ErrMsg,Viewer);
+  if Result<>shrSuccess then exit;
+
+  // call viewer
+  Node:=nil;
+  try
+    Node:=THelpNode.CreateURL(Self,Title,URL);
+    Result:=Viewer.ShowNode(Node,ErrMsg);
+  finally
+    Node.Free;
+  end;
+end;
+
+function TCHMHelpDatabase.GetNodesForKeyword(const HelpKeyword: string;
+  var ListOfNodes: THelpNodeQueryList; var ErrMsg: string): TShowHelpResult;
+var
+  Path: String;
+begin
+  Result:=inherited GetNodesForKeyword(HelpKeyword, ListOfNodes, ErrMsg);
+  if Result<>shrSuccess then exit;
+
+  if not (csDesigning in ComponentState)
+  and (KeywordPrefix<>'')
+  and (LeftStr(HelpKeyword,length(KeywordPrefix))=KeywordPrefix) then begin
+    // HelpKeyword starts with KeywordPrefix -> add default node
+    if FHelpNode=nil then
+      FHelpNode:=THelpNode.CreateURL(Self,'','');
+    Path:=copy(HelpKeyword,length(KeywordPrefix)+1,length(HelpKeyword));
+    FHelpNode.Title:='Show page '+Path+' of '+ExtractFileName(Filename);
+    FHelpNode.URL:='chmfile://'+FilenameToURLPath(Filename)+'?'+CHMPathParam+'='+Path;
+    CreateNodeQueryListAndAdd(FHelpNode,nil,ListOfNodes,true);
+  end;
+end;
+
+procedure TCHMHelpDatabase.Load(Storage: TConfigStorage);
+begin
+  inherited Load(Storage);
+  KeywordPrefix:=Storage.GetValue('KeywordPrefix','');
+  Filename:=Storage.GetValue('Filename','');
+end;
+
+procedure TCHMHelpDatabase.Save(Storage: TConfigStorage);
+begin
+  inherited Save(Storage);
+  Storage.SetDeleteValue('KeywordPrefix',KeywordPrefix,'');
+  Storage.SetDeleteValue('Filename',Filename, '');
+end;
+
+end.
+

components/chmhelp/packages/help/lhelpcontrolpkg.lpk

@@ -21,12 +21,18 @@
     <Description Value="This package contains unit that will allow you to &quot;remote control&quot; the program LHelp."/>
     <License Value="Modified LGPL-2, same as LCL"/>
     <Version Minor="2"/>
-    <Files Count="1">
+    <Files Count="2">
       <Item1>
         <Filename Value="lhelpcontrol.pas"/>
         <UnitName Value="LHelpControl"/>
       </Item1>
+      <Item2>
+        <Filename Value="lazhelpchm.pas"/>
+        <HasRegisterProc Value="True"/>
+        <UnitName Value="LazHelpCHM"/>
+      </Item2>
     </Files>
+    <Type Value="RunAndDesignTime"/>
     <RequiredPkgs Count="2">
       <Item1>
         <PackageName Value="LCL"/>

components/chmhelp/packages/help/lhelpcontrolpkg.pas

@@ -7,8 +7,15 @@ unit lhelpcontrolpkg;
 interface
 
 uses
-  LHelpControl; 
+  LHelpControl, LazHelpCHM, LazarusPackageIntf;
 
 implementation
 
+procedure Register;
+begin
+  RegisterUnit('LazHelpCHM', @LazHelpCHM.Register);
+end;
+
+initialization
+  RegisterPackage('lhelpcontrolpkg', @Register);
 end.